public function executeGetadsbygps(sfWebRequest $request)
{
    $this->ads = array();
    $this->ads = AdDescriptionTable::getInstance()->
        getAdsByGPSAndUserIdAndLanguageId(
           $this->getRoute()->getParameters(),
           $this->getUser()->getGuardUser()->getId(),
           $this->getUser()->getGuardUser()->getLanguage()->getId());

    if (empty($this->ads))
        die;
}